
1
Micropower, Rail-to-Rail Input Current Sense Amplifier
with Voltage Output
ISL28005
The ISL28005 is a micropower, uni-directional high-side and
low-side current sense amplifier featuring a proprietary rail-to-rail
input current sensing amplifier. The ISL28005 is ideal for
high-side current sense applications where the sense voltage is
usually much higher than the amplifier supply voltage. The
device can be used to sense voltages as high as 28V when
operating from a supply voltage as low as 2.7V. The micropower
ISL28005 consumes only 50A of supply current when operating
from a 2.7V to 28V supply.
The ISL28005 features a common-mode input voltage range
from 0V to 28V. The proprietary architecture extends the input
voltage sensing range down to 0V, making it an excellent choice
for low-side ground sensing applications. The benefit of this
architecture is that a high degree of total output accuracy is
maintained over the entire 0V to 28V common mode input
voltage range.
The ISL28005 is available in fixed (100V/V, 50V/V and 20V/V)
gains in the space saving 5 Ld SOT-23 package. The parts
operate over the extended temperature range from -40°C to
+125°C.
Features
Low Power Consumption. . . . . . . . . . . . . . . . . . . . . . .50A,Typ
Supply Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.7V to 28V
Wide Common Mode Input. . . . . . . . . . . . . . . . . . . . 0V to 28V
Fixed Gain Versions
- ISL28005-100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100V/V
- ISL28005-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V/V
- ISL28005-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V/V
Operating Temperature Range. . . . . . . . . . .-40°C to +125°C
Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Ld SOT-23
Applications
Power Management/Monitors
Power Distribution and Safety
DC/DC, AC/DC Converters
Battery Management/Charging
Automotive Power Distribution
Related Literature
See
AN1531 for “ISL28005 Evaluation Board User’s Guide”
See
AN1567 for “ISL28005, ISL28006 Unidirectional Current
Sense Amplifiers”
ISL28005
GND
ISL28005
+5VDC
+12VDC
+
-
+1.0VDC
SENSE
OUTPUT
+5VDC
OUTPUT
+12VDC
OUTPUT
MULTIPLE
OUTPUT
POWER SUPPLY
ISENSE
+12VDC
ISENSE
+5VDC
ISENSE
+1.0VDC
+
-
+
-
RSENSE
+5VDC
RSENSE
FIGURE 1. TYPICAL APPLICATION
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
TIME (ms)
VOLTS
(
V
)
VTH(L-H) = 1.52V
VTH(H-L) = 1.23V
VRS+
G100, VOUT = 1V
G50, VOUT = 500mV
G20, VOUT = 200mV
VOUT (G=100)
FIGURE 2. HIGH-SIDE AND LOW-SIDE THRESHOLD VOLTAGE
October 24, 2013
FN6973.5
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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